firebase-ios-sdk: iOS: Notification doesn't appear if my app is in foreground but works if it's in background

• Using APNS Auth key instead of certificates.

• React Native Project

• xcode: 11.3.1

• pods:

pod ‘RNFirebase’, :path => ‘…/node_modules/react-native-firebase/ios’ pod ‘Firebase/Analytics’ pod ‘Firebase/Core’ pod ‘Firebase/Messaging’

Here’s my AppDelegate:

//
//  AppDelegate.swift


import Foundation
import UIKit
import AVFoundation
import CoreLocation
import CoreMotion
import Firebase
import Siren
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
  let gcmMessageIDKey = "gcm.message_id"
  
  func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    
    FirebaseApp.configure()
    self.initializeFCM(application)
    return true
  }
  
  private func initializeFCM(_ application: UIApplication)
  {
      print("initializeFCM")

      if #available(iOS 10.0, *)
      {
          UNUserNotificationCenter.current().delegate = self
          UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { (accepted, error) in
           !accepted ? print("Notification access denied.") : print("Notification access accepted.")
          }
      } else {
          let notificationTypes: UIUserNotificationType = [.alert,.badge, .sound]
          let settings = UIUserNotificationSettings(types: notificationTypes, categories: nil);
          application.registerUserNotificationSettings(settings);
      }
      Messaging.messaging().delegate = self
     application.registerForRemoteNotifications();
  }
  
  func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    print("DEVICE TOKEN = \(deviceToken)")
    Messaging.messaging().apnsToken = deviceToken
  }
  
  func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print(error)
  }

  func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {
    if let messageID = userInfo[(gcmMessageIDKey as AnyObject) as! NSObject] {
        print("Message ID: \(messageID)")
    }
    print(userInfo)
  }
  
  func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                   fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
    if let messageID = userInfo[gcmMessageIDKey] {
      print("Message ID: \(messageID)")
    }
    print(userInfo)

    completionHandler(UIBackgroundFetchResult.newData)
  }
  
}

extension AppDelegate : MessagingDelegate {
  // [START refresh_token]
  func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
    print("Firebase registration token: \(fcmToken)")
    Messaging.messaging().shouldEstablishDirectChannel = true

    let dataDict:[String: String] = ["token": fcmToken]
    NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
  }
  
  func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) {
    print("Received data message: \(remoteMessage.appData)")
  }
}

@available(iOS 10.0, *)
extension AppDelegate: UNUserNotificationCenterDelegate {

  // Receive displayed notifications for iOS 10 devices.
  func userNotificationCenter(_ center: UNUserNotificationCenter,
  willPresent notification: UNNotification,
  withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
    let userInfo = notification.request.content.userInfo
    if let messageID = userInfo[gcmMessageIDKey] {
      print("Message ID: \(messageID)")
    }

    // Print full message.
    print(userInfo)

    // Change this to your preferred presentation option
    completionHandler([.alert, .badge, .sound])
  }

  func userNotificationCenter(_ center: UNUserNotificationCenter,
                              didReceive response: UNNotificationResponse,
                              withCompletionHandler completionHandler: @escaping () -> Void) {
    let userInfo = response.notification.request.content.userInfo
    // Print message ID.
    if let messageID = userInfo[gcmMessageIDKey] {
      print("Message ID: \(messageID)")
    }

    // Print full message.
    print(userInfo)

    completionHandler()
  }
}